Police are asking parents in the Oswego, Batavia and St. Charles area to check their children's Facebook friends.
Authorities say Eric Hakala set up an account under the name Mike Evans and pretended to be a 15-year-old student from St. Charles East High School.
Hakala is accused of having sexual chats with children and trading inappropriate pictures.
Parents of anyone contacted by Hakala are asked to preserve all conversations and photos and contact police.
